Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent
1984-08-31
1986-09-30
Moore, David K.
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
313407, 313482, 313477R, 313284, 313348, H01J 2981, H01J 3100, H01J 190, H01J 146
Patent
active
046148922
ABSTRACT:
An improvement in a tension mask type color cathode ray tube comprising an envelope funnel that includes a bell portion, one extremity of which has a sealing land. The tube further comprises a flat face panel formed of a material having a predetermined temperature coefficient of expansion. The panel has a target area adapted to receive a pattern of luminescent color phosphor deposits. A sealing surface circumscribes the target areas. The improvement concerns a constituent structure which is disposed between the funnel sealing land and the panel sealing surface and which is frit sealed therebetween. The structure defines a central opening which is dimensioned to enclose the panel target area and it is formed of a material having a temperature coefficient of expansion approximating that of the face panel. The structure itself comprises means which define a support surface that confronts the target, which surface is adapted to fixedly receive a tensed color selection mask. Additionally, the structure includes means that serve to establish the tensed mask at a predetermined Q distance from the target area.
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Moore David K.
O'Connor Cornelius J.
Razavi M.
Zenith Electronics Corporation
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